diff --git a/apps/emqx_dashboard_rbac/test/emqx_dashboard_rbac_SUITE.erl b/apps/emqx_dashboard_rbac/test/emqx_dashboard_rbac_SUITE.erl
index 607cb710d..73094f059 100644
--- a/apps/emqx_dashboard_rbac/test/emqx_dashboard_rbac_SUITE.erl
+++ b/apps/emqx_dashboard_rbac/test/emqx_dashboard_rbac_SUITE.erl
@@ -61,11 +61,11 @@ t_permission(_) ->
         }
     ),
 
-    ?assertEqual(
+    ?assertMatch(
         #{
-            <<"username">> => ViewerUser,
-            <<"role">> => ?ROLE_VIEWER,
-            <<"description">> => ?ADD_DESCRIPTION
+            <<"username">> := ViewerUser,
+            <<"role">> := ?ROLE_VIEWER,
+            <<"description">> := ?ADD_DESCRIPTION
         },
         emqx_utils_json:decode(Payload, [return_maps])
     ),
@@ -104,11 +104,11 @@ t_update_role(_) ->
         }
     ),
 
-    ?assertEqual(
+    ?assertMatch(
         #{
-            <<"username">> => ?DEFAULT_SUPERUSER,
-            <<"role">> => ?ROLE_VIEWER,
-            <<"description">> => ?ADD_DESCRIPTION
+            <<"username">> := ?DEFAULT_SUPERUSER,
+            <<"role">> := ?ROLE_VIEWER,
+            <<"description">> := ?ADD_DESCRIPTION
         },
         emqx_utils_json:decode(Payload, [return_maps])
     ),
diff --git a/apps/emqx_dashboard_sso/src/emqx_dashboard_sso_api.erl b/apps/emqx_dashboard_sso/src/emqx_dashboard_sso_api.erl
index 2f1c19d29..93a5d7be7 100644
--- a/apps/emqx_dashboard_sso/src/emqx_dashboard_sso_api.erl
+++ b/apps/emqx_dashboard_sso/src/emqx_dashboard_sso_api.erl
@@ -8,14 +8,12 @@
 
 -include_lib("hocon/include/hoconsc.hrl").
 -include_lib("emqx/include/logger.hrl").
--include_lib("typerefl/include/types.hrl").
 
 -import(hoconsc, [
     mk/2,
     array/1,
     enum/1,
-    ref/1,
-    union/1
+    ref/1
 ]).
 
 -export([
@@ -37,7 +35,7 @@
 -define(BAD_USERNAME_OR_PWD, 'BAD_USERNAME_OR_PWD').
 -define(BAD_REQUEST, 'BAD_REQUEST').
 -define(BACKEND_NOT_FOUND, 'BACKEND_NOT_FOUND').
--define(TAGS, <<"Dashboard Single Sign-on">>).
+-define(TAGS, <<"Dashboard Single Sign-On">>).
 
 namespace() -> "dashboard_sso".
 
@@ -58,7 +56,7 @@ schema("/sso") ->
             tags => [?TAGS],
             desc => ?DESC(get_sso),
             responses => #{
-                200 => array(enum(emqx_dashboard_sso:types()))
+                200 => array(ref(backend_status))
             }
         }
     };
@@ -189,7 +187,7 @@ backend_name_as_arg(In, Extra, Default) ->
                 #{
                     in => In,
                     desc => ?DESC(backend_name_in_qs),
-                    required => true,
+                    required => false,
                     example => Default
                 }
             )}
diff --git a/apps/emqx_dashboard_sso/src/emqx_dashboard_sso_ldap.erl b/apps/emqx_dashboard_sso/src/emqx_dashboard_sso_ldap.erl
index dc7e6a74a..adde6c274 100644
--- a/apps/emqx_dashboard_sso/src/emqx_dashboard_sso_ldap.erl
+++ b/apps/emqx_dashboard_sso/src/emqx_dashboard_sso_ldap.erl
@@ -12,7 +12,8 @@
 -behaviour(emqx_dashboard_sso).
 
 -export([
-    fields/1
+    fields/1,
+    desc/1
 ]).
 
 -export([
@@ -51,6 +52,11 @@ query_timeout(desc) -> ?DESC(?FUNCTION_NAME);
 query_timeout(default) -> <<"5s">>;
 query_timeout(_) -> undefined.
 
+desc(ldap) ->
+    "LDAP";
+desc(_) ->
+    undefined.
+
 %%------------------------------------------------------------------------------
 %% APIs
 %%------------------------------------------------------------------------------
diff --git a/apps/emqx_ldap/src/emqx_ldap.erl b/apps/emqx_ldap/src/emqx_ldap.erl
index 021916339..f16166793 100644
--- a/apps/emqx_ldap/src/emqx_ldap.erl
+++ b/apps/emqx_ldap/src/emqx_ldap.erl
@@ -25,7 +25,7 @@
 %% ecpool connect & reconnect
 -export([connect/1]).
 
--export([roots/0, fields/1]).
+-export([roots/0, fields/1, desc/1]).
 
 -export([do_get_status/1]).
 
@@ -100,6 +100,11 @@ fields(bind_opts) ->
             )}
     ].
 
+desc(ssl) ->
+    ?DESC(emqx_connector_schema_lib, "ssl");
+desc(_) ->
+    undefined.
+
 server() ->
     Meta = #{desc => ?DESC("server")},
     emqx_schema:servers_sc(Meta, ?LDAP_HOST_OPTIONS).